Assembly programming on POSIX/UNIX like OSes

ishare | 7 Apr 2013 05:39

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Re: how does ld.so call ELF's entry?

On Sun, Apr 07, 2013 at 05:11:28AM +0200, Sofiane Akermoun wrote:
> Hello,
> 
> 
> The interpreter is specified during linking process and the program header
> of your binary is filled with good values.
> Then when the operating system load your binary, he finds next the
> interpreter to use.
> The linker ld sets the good values by default but you can overwrite it or
> specify other values if you want.
> The steps are:
> 1)The operating system loads your binary
> 2)The program loader system execute the Interpreter specifiy in the binary
> 3)The interpreter gather all the dynamic libraries needed in memory

> 4)The Control is passed to the entry point of your program

  How does  the step 4 been  done ?

  thanks!
> 
> The entry point is specified in your code source as a "global". And could
> be find in your object file by the linker.
> In theory there are some default tag to specify entry point, like "..start"
> for nasm, but you can also passed it to the linker.
> 
> regards,
> 
> Sofiane Akermoun
> akersof <at> gmail.com

(Continue reading)

ishare | 7 Apr 2013 04:19

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how does ld.so call ELF's entry?


  For an ELF ,which needs a interpreter , how is it  been called by the interpreter ?

  As I know the interpreter is loaded first and do something essential ,then call the main routine of ELF .
  How is this procedure implemented ?

  Thanks!
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ishare | 18 Mar 2013 15:52

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how to disassembly a specified section


  I need to look up the disassembly  content of a section in an elf ?
  how to type that command ?

  thanks!
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Meher Assel | 11 Mar 2013 23:09

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[NASM] ROR -> error: invalid combination of opcode and operands

Hello all,
why i can't do ' ror al,bl' ?
i'am using nasm in 16bits mode ( [BITS 16] )
i get this error when compiling:
error: invalid combination of opcode and operands
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Каролинчик Калошина | 11 Mar 2013 13:18

Круглосутoчные перeвoзки грyзoв

                  http://www.jasoncarter.com/portfolio/u3.php

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Germaine Sandoval | 10 Mar 2013 22:42

Greetings from George Daniels


Greetings from George Daniels

I am George Daniels, a Banker and credit system programmer (HSBC bank). 
I saw your email address while browsing through  the bank D.T.C Screen in my office 
yesterday so I decided to use this very chance to know you. I believe 
we should use every opportunity to know each other better. However, I am contacting you 
for obvious reason which you will understand. 

I am sending this mail just to know if this email address is OK, 
reply me back so that I will send  more details to you. 
I have a very important thing to discuss with you, I look forward to receiving your response at 
georgedaniels <at> postino.net. Have a pleasant day.

George Daniels
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ishare | 3 Mar 2013 20:50

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how to use .section command in asm code?


can .section command be used in asm code to define a section ?

is there any examples?

thanks!
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ishare | 3 Mar 2013 18:21

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what does this do ?


here are a portion of  build-in asm code  :

    "  .long 661b\n"                    \
    "  .long 663f\n"            \
    "  .byte %c0\n"             /               \
    "  .byte 662b-661b\n"                       \
    "  .byte 664f-663f\n"

what is 661b ,663f ? etc . 
what do they  mean?

thanks!
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Wallace, Raequel (HRSA | 2 Mar 2013 04:40

Grüße aus China

Grüße aus China

_______________________________

Hallo aus Hong Kong, ich möchte Sie zu mir in einer Geldtransaktion Geschäft zu unterstützen. Bitte
antworten Sie mir wieder nur auf meiner privaten

E-Mail-Adresse für weitere Informationen andrewliu19 <at> yahoo.com.hk oder andrewliu45 <at> aol.com ich
Englisch spreche, sprechen Sie Englisch? Vielen Dank.

Mr. Andrew Liu

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horseriver | 18 Feb 2013 06:06

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different asm code

hi:)

  I have compiled a .S file ,using command gcc -c x.S -o x.
  Then I use objdump to look up its asm code, even find that some code is not the
  same as that .S file , more important is , some code in origin  .S file has disappear .

  what is about the reason ? If it is due to version , why some code chould get lost after compile?

thanks!
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Recent entries

how does ld.so call ELF's entry? (7 Apr 2013)
how does ld.so call ELF's entry? (7 Apr 2013)
how to disassembly a specified section (18 Mar 2013)
BUSINESS PROPOSITION.‏ (15 Mar 2013)
[NASM] ROR -> error: invalid combination of opcode and operands (11 Mar 2013)
Круглосутoчные перeвoзки грyзoв (11 Mar 2013)
Greetings from George Daniels (10 Mar 2013)
how to use .section command in asm code? (3 Mar 2013)
what does this do ? (3 Mar 2013)
Grüße aus China (2 Mar 2013)
different asm code (18 Feb 2013)
gdtr value (18 Feb 2013)
what does this do? (17 Feb 2013)
varibles define (13 Feb 2013)
.word _XY_ (12 Feb 2013)
mov instruction (7 Feb 2013)
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